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MP Board Class 12 (MPBSE) d- and f-Block Elements — practice questions

Explore 21 free d- and f-Block Elements questions in MP Board Class 12 (MPBSE) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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d- and f-Block Elements questions and exercises with answers

Showing questions 1–21 of 21.

Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?Read the answer and worked solution →Ethylenediamine (en) is best described as a:Read the answer and worked solution →The coordination number 6 most commonly gives which geometry?Read the answer and worked solution →The IUPAC name of K3[Fe(CN)6] is:Read the answer and worked solution →The drug CISPLATIN has the formula [Pt(NH3)2Cl2]. Its anti-cancer activity comes from the:Read the answer and worked solution →In Valence Bond Theory, an octahedral LOW-SPIN complex like [Co(NH3)6]³⁺ uses which hybridisation?Read the answer and worked solution →In Crystal Field Theory, the 5 d-orbitals in an OCTAHEDRAL field split into:Read the answer and worked solution →In the spectrochemical series, which ligand is the STRONGEST field?Read the answer and worked solution →The unusual stability of EDTA-metal complexes is mainly due to the:Read the answer and worked solution →The biological molecule HAEMOGLOBIN contains which metal at its centre?Read the answer and worked solution →A COORDINATION COMPOUND consists of a central metal atom (or ion) BONDED to a set of surrounding molecules or ions, calledRead the answer and worked solution →The COORDINATION NUMBER of the central metal in a complex isRead the answer and worked solution →A ligand that has ONLY ONE donor atom (which forms a single bond to the central metal) is calledRead the answer and worked solution →In the complex $[\mathrm{Co(NH_3)_5\,Cl}]\mathrm{Cl_2}$, the oxidation state of cobalt isRead the answer and worked solution →ETHYLENEDIAMINETETRAACETATE (EDTA) is a famous polydentate ligand. It isRead the answer and worked solution →The IUPAC name of $[\mathrm{Co(NH_3)_6}]^{3+}$ isRead the answer and worked solution →Cis-trans isomerism is observed inRead the answer and worked solution →Coordination compounds of transition metals are often COLOURED. CFT explains this colour as arising fromRead the answer and worked solution →$[\mathrm{Ni(CO)_4}]$ is tetrahedral and diamagnetic. The oxidation state of nickel in this complex isRead the answer and worked solution →The HEXACYANIDOFERRATE(II) ion $[\mathrm{Fe(CN)_6}]^{4-}$ contains iron in oxidation stateRead the answer and worked solution →Which of the following coordination compounds shows OPTICAL ISOMERISM?Read the answer and worked solution →

Worked practice questions

Among $\mathrm{Sc^{3+}}$, $\mathrm{Ti^{4+}}$, $\mathrm{V^{2+}}$ and $\mathrm{Zn^{2+}}$, which is **coloured** in aqueous solution?

  1. $\mathrm{Sc^{3+}}$
  2. $\mathrm{Ti^{4+}}$
  3. $\mathrm{V^{2+}}$
  4. $\mathrm{Zn^{2+}}$
Show answer and solution

Correct answer: C. $\mathrm{V^{2+}}$

Colour in transition-metal aquo ions comes from $d$-$d$ transitions, which require partially-filled $d$-orbitals. $\mathrm{Sc^{3+}}$ ($d^0$), $\mathrm{Ti^{4+}}$ ($d^0$) and $\mathrm{Zn^{2+}}$ ($d^{10}$) all have either empty or completely filled d-shells, so they are colourless. $\mathrm{V^{2+}}$ is $d^3$, giving a violet colour in solution.

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Ethylenediamine (en) is best described as a:

  1. Monodentate ligand, with one donor atom per molecule
  2. Bidentate ligand, with two N donor atoms per molecule
  3. Tridentate ligand, with three donor atoms in chelation
  4. Hexadentate ligand, with six donor atoms like EDTA
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Correct answer: B. Bidentate ligand, with two N donor atoms per molecule

Ethylenediamine has two nitrogen donor atoms; bidentate.

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The coordination number 6 most commonly gives which geometry?

  1. Tetrahedral, with 109.5° angles
  2. Octahedral, with 90° angles
  3. Square planar, with 90° angles
  4. Linear, with 180° angle
Show answer and solution

Correct answer: B. Octahedral, with 90° angles

CN 6 → octahedral (most common in coordination chemistry). 4 → tetrahedral or square planar. 2 → linear (e.g., Ag(NH3)2⁺).

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More Chemistry topics

Coordination CompoundsNamed ReactionsAlcohols Phenols EthersChemical KineticsSolid StateAlkenesAtomic combinationsAtoms and Elements